Speed Estimation Method for Sensor Less Control of AC Motor Drives Based on Stator Field Orientation
Based on stator-field-orientation control combining with both direct torque control (DTC) and rotor-field-orientation control a speed estimation scheme is presented in this paper. Two key problems are discussed in detail. First is to use phase operation to decide stator-field-orientation angle θs and then the discrete-tracking-differential (DTD) technique is employed to high quality stator current. The experiments show that accurate speed estimation can be obtained by the method.
S. Q. Chen et al., "Speed Estimation Method for Sensor Less Control of AC Motor Drives Based on Stator Field Orientation", Applied Mechanics and Materials, Vols. 130-134, pp. 1361-1364, 2012